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Z3 cooling system fail

Posted: Thu Jun 25, 2020 5:51 pm
by Rascal69
Customer calls me up and says he got a radiator leak on a car he just purchased. We arrange and he brings it in . This is what I have to work with. 122000kms on the clock.

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Removed the radiator ... Image shocked.
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Radiator broke so the previous hack mechanic qbond it shut. Then tap a new valve and seal with with bathroom silicone, pratley steel and qbond. And expected it to hold pressure under operating temps.

I opted for a new radiator, took two weeks but it arrived and everything became clear.

Will post more as we progress.

Re: Z3 cooling system fail

Posted: Thu Jun 25, 2020 6:06 pm
by Greenz
Dafuq!?!?!?

Re: Z3 cooling system fail

Posted: Thu Jun 25, 2020 9:45 pm
by Unobeat
Tjeeeeer

That Old Radiator has seen better days, pure abuse of such a gem of a car of low kilos.

Re: Z3 cooling system fail

Posted: Fri Jun 26, 2020 11:43 am
by DJ7
How some people can do things like that is beyond me.

Sent from my SM-A305F using Tapatalk


Re: Z3 cooling system fail

Posted: Fri Jun 26, 2020 11:57 am
by Rascal69
Yeah guys, there’s people out there hacking away at customers cars.

I’ve got a lot of work planned for the z3:
1. Full engine service
2. Auto Gearbox service
3. Diff oil change
4. Full cooling system refresh: radiator, thermostat, updated aluminum thermostat housing, new waterpump, new water bottle and cap as well.
5. New Ac belt, tensioner, pulley.
6. New V belt , tensioner and pulley.
7. New Tappet cover gasket
8. Front seals on cyl head

There’s a lot of sludge build up in here so I have to run engine flush with new wolf 5w40 oil , then drain out as much of the sludge before Filling up with the LM molygen oil and Ceratec additive.

Re: Z3 cooling system fail

Posted: Mon Jul 06, 2020 11:32 am
by Rascal69
Z3 is out the workshop so it’s time to update :

Started collecting parts :

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Began with a service
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Then we started with the cooling system issues. Drained the radiator and the engine block of all the water they had filled when doing the shitty repairs .
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And then started getting the radiator out
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Had to cut this pipe as they stuck it on .
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Called up Bmw and placed an order for a new radiator and that pipe which We cut.


Gearbox oil cooler mounted to the old radiator, will be swapped over to the new unit
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These two seals had an oil sweat, while we were there we replaced them too
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Then both the belts, tensioners and pulleys needed to be replaced, so those where ordered too.
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We then fitted the radiator and the rest of the new components in the cooling system.

We noticed a lot of sludge build up when replacing the tappet cover so we decided to do an engine flush with cheap oil before filling up the more expensive liqui moly engine oil with the Ceratec additive .

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Then we drained the old Geabox Fluid out .
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Dropped the gearbox oil pan and the oil filter
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Cleaned and prepped for the gasket.
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New gasket
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Installed the new filter and gasket and bolted up the oil pan then torqued to spec.
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Filled up gearbox oil the old school way lol
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Checked coolant and top up
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Add Ceratec additive
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Fill up with oil and a new oil filter
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Also drained and filled new oil in the differential
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New belts and tensioner
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Vehicle completed and owner collected. He was Very happy guy after this since he now had confidence in his vehicle and wasn’t afraid to drive back to pta.

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Re: Z3 cooling system fail

Posted: Mon Jul 06, 2020 11:31 pm
by Belix
Quite a job there, thanks for the walk-through and pictures.